Hi Chris,
This area being repaired is an old parking area, now serving as the base
for two rows of private hangars. I took another walk this morning, and
they had one more pour needed to finish. The old concrete appeared to
be 12 inches thick, and not reinforced.
I have never seen a cut in one of the runways, so I can't say how thick
they are, or whether or not they were reinforced.
The mixer lorry is a common design that we see here all the time. I
have never examined one in detail, but they seem to have a powerplant at
the back, and deliver the concrete out the front, so the operator can
remain in the cab. They are awkward looking, but seem to be very efficient.
Jim Nichols
Tullahoma, TN USA
On 2/19/2016 11:51 AM, ChrisB wrote:
That doesn’t look very thick, Jim. Was that the runway or only a taxiway? I ask because
I’m fairly certain that the concrete at my old base, RAF Brüggen, was probably twice
as deep as that looks.
That mixer lorry looks very strange compared with ones that I’ve seen in the UK.
Chris
On 18 Feb 2016, at 20:19, Jim Nichols <jhnichols@xxxxxxxxxxxxx> wrote:
I took a walk in the sunshine today at the local airport. Felt good!
This airport was built during WWII as an US Army Air Force training base for
B-24s, hence the concrete was very thick to withstand the wheel loads. While
much of it has held up well, places that received a lot of traffic have
developed cracks. A contractor has been hired to cut out these broken areas
and replace them with new concrete. ( It is interesting to me that, while
concrete made today in our area uses crushed limestone as the aggregate, I have
seen areas of the original pours that used creek gravel, including a few mussel
shells, as the aggregate.)
This image gives an idea of the thickness of the original concrete.
http://www.gallery.leica-users.org/v/OldNick/Thick+Concrete+3162.tif.html
<http://www.gallery.leica-users.org/v/OldNick/Thick+Concrete+3162.tif.html>
To tie the new to the old, the old concrete is drilled and rebar is installed.
http://www.gallery.leica-users.org/v/OldNick/Drilling+for+Rebar+3163.tif.html
<http://www.gallery.leica-users.org/v/OldNick/Drilling+for+Rebar+3163.tif.html>
About half of this section has been replaced, as the crews work with manageable
pour sections.
http://www.gallery.leica-users.org/v/OldNick/Working+Concrete+3157.tif.html
<http://www.gallery.leica-users.org/v/OldNick/Working+Concrete+3157.tif.html>
The rotating mixer drum must be washed out after each pour.
http://www.gallery.leica-users.org/v/OldNick/Wash+Job+3161.tif.html
<http://www.gallery.leica-users.org/v/OldNick/Wash+Job+3161.tif.html>
And then, the truck heads back to the plant for another load. Multiple trucks
were in use, to keep the job moving at a workable pace.
http://www.gallery.leica-users.org/v/OldNick/Going+to+Reload+3165.tif.html
<http://www.gallery.leica-users.org/v/OldNick/Going+to+Reload+3165.tif.html>
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